Former lawyer founded real estate developer Lerner Enterprises in 1952. Built massive Washington, D.C.-area malls Tysons Corner Center, Tysons II and White Flint. Today owns 20 million square feet of commercial, retail space and 6,000 apartments. Has sold 22,000 private homes; currently building new subdivisions in Washington suburbs. Also owns stake in NYC's Chelsea Piers. Last spring with 14 other investors bought pro baseball's Washington Nationals for $450 million; Lerner's son and 2 sons-in-law will run franchise. City broke ground on a $610 million stadium last May.